I.S. EN 15302:2021
Current
The latest, up-to-date edition.
Railway applications - Wheel-rail contact geometry parameters - Definitions and methods for evaluation
Hardcopy , PDF
English
25-10-2021
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European foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Overview of the process for determining contact parameters
6 Description of wheel and rail profiles
7 Plausibility check and processing of measured wheel and rail profiles
8 Determining the wheel-rail contact positions and contact functions
9 Determining the equivalent conicity and the related nonlinearity parameter
10 Determining the rolling radii coefficient
11 Other wheel-rail contact parameters
12 Testing of calculation software for contact geometry parameters
13 Assessment of the complete process for determination of wheel-rail contact parameters
Annex A (informative) Example of presentation of contact geometry functions
Annex B (informative) Derivation of the kinematic equation of wheelset motion
Annex C (informative) Determination of the lateral peak displacements
Annex D (informative) Method for determining the wavelength of the wheelset motion by two-step integration of the nonlinear differential equation
Annex E (informative) Method for determining the wavelength of the wheelset motion by direct integration of the nonlinear differential equation
Annex F (informative) Method for determining the equivalent conicity by linear regression of the Δr function
Annex G (informative) Method for determining linearization parameters by harmonic linearization
Annex H (informative) Handling of special cases of the Δr function
Annex I (normative) Reference profiles for testing
Annex J (normative) Calculation results with reference profiles
Annex K (normative) Tolerances on equivalent conicity for testing calculations
Bibliography
This document establishes definitions and evaluation methods for wheel-rail contact geometry parameters influencing the vehicle running dynamic behaviour: — the rolling radius difference between the two wheels of a wheelset (Δr-function) which serves as a basis for all further calculations; — the equivalent conicity function from which are derived: — a single equivalent conicity value for a specified amplitude which is relevant for the assessment of vehicle running stability on straight track and in very large radius curves according to EN 14363; — the nonlinearity parameter which characterizes the shape of this function and is related to the vehicle behaviour particularly in the speed range close to the running stability limit; — the rolling radii coefficient which is used to describe the theoretical radial steering capability of a wheelset in a curved track.
| Committee |
CEN/TC 256
|
| DocumentType |
Standard
|
| Pages |
146
|
| ProductNote |
The date of any NSAI previous adoption may not match the date of its original CEN/CENELEC document.
|
| PublisherName |
National Standards Authority of Ireland
|
| Status |
Current
|
| Supersedes |
| Standards | Relationship |
| EN 15302:2021 | Identical |
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